Wow, that was really cool.
The movement is a bit rough, especially for how precise some of the platforming is. I'm pretty sure that the collision boxes had their corners cut off so you could easily move about them, which is good, but I don't think its necessary on the tops, since it only made me fall off a lot. Although, I could see the argument that the movement being rough is kind of a part of the experience with the theming of the game.
Honestly, I would consider the next part of this comment spoilers, so play the game first before reading! :)
I like the fake out of the doors, when I saw the other one I was wondering how I would open it. But having the first one tell me to read the manual (which I bet no-one will do right away) Then finding out about the invisible blocks only seen with the red filter was just super cool!
Maybe the blocks were easier to see with a physical red filter over the app, but they were very difficult to see with the app. I ended up just memorizing where things were on some screens.
Sadly, the phone website would sometimes just stop working, in which I would need to rescan the code since refreshing the page wouldn't work.
I couldn't get the seeing cyan code to work, but I think it was for the better since using a physical object is a cooler experience.
I don't exact see how it fits the limitation, unless its meant to be that you are your own enemy by not reading the manual at the start...
I would love to see a continuation of this, with having a very long manual with a ton of obscure controls and ways to doing things on it. Feels like playing an ARG.
Really, really cool game! :)